CVE-2026-90017

In the Linux kernel, the following vulnerability has been resolved:

staging: rtl8723bs: fix OOB read in rtw_action_frame_parse()

rtw_action_frame_parse() takes a frame_len parameter but never actually checks it before indexing into the frame body:

const u8 *frame_body = frame + sizeof(struct ieee80211_hdr_3addr);
...
c = frame_body[0];
...
a = frame_body[1];

frame_body already points 24 bytes (sizeof(struct ieee80211_hdr_3addr)) into frame, so reading frame_body[0] and frame_body[1] requires frame_len >= 26. A management action frame shorter than that (e.g. exactly 24 bytes, the minimum a malicious peer can send) causes a 1-2 byte out-of-bounds read.

This is reachable from rtw_cfg80211_monitor_if_xmit_entry() and cfg80211_rtw_mgmt_tx() in ioctl_cfg80211.c, both of which pass attacker/user-influenced frame buffers and lengths straight through.

Add the missing length check before frame_body is dereferenced.

Affected Software

References

• https://git.kernel.org/stable/c/0b7f64c7bb9664777168768c6b44affb07dcbf24
• https://git.kernel.org/stable/c/136f9a3ab87ded8aaf081425cfb2059659dd9023
• https://git.kernel.org/stable/c/1410bce22351ba15d8e58287cbf09d55d7f21fc9
• https://git.kernel.org/stable/c/15081ff835b29e456da29303b32efc436df04695
• https://git.kernel.org/stable/c/310aaa8058d19cc431aedac0f5bb814e84479393
• https://git.kernel.org/stable/c/a54fd1a44862d263df9f8bc17fca3620be31addb
• https://git.kernel.org/stable/c/b041e3f35e0d262d42a711094ab594634d72744a
• https://git.kernel.org/stable/c/ff917923f4fb9c83717ba135ee47d7e4c1567bb7